Snippet below.
If I wanted a root install, i would be root. in all other cases,
the python wrappings install convention should be put it in $prefix/lib*/*
as usual with python. Issue a reminder and sed the correct pythonpath settings
into an scripts that need them. As it is, I cannot test pygtk interface.

Return the directory for either the general or platform-dependent library installation. If plat_specific is true, the platform-dependent include directory is returned; if false or omitted, the platform-independent directory is returned. If prefix is given, it is used as either the prefix instead of PREFIX, or as the exec-prefix instead of EXEC_PREFIX if plat_specific is true. If standard_lib is true, the directory for the standard library is returned rather than the directory for the installation of third-party extensions.